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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_POWERPC_BUG_H
3#define _ASM_POWERPC_BUG_H
4#ifdef __KERNEL__
5
6#include <asm/asm-compat.h>
7#include <asm/extable.h>
8
9#ifdef CONFIG_BUG
10
11#ifdef __ASSEMBLY__
12#include <asm/asm-offsets.h>
13#ifdef CONFIG_DEBUG_BUGVERBOSE
14.macro __EMIT_BUG_ENTRY addr,file,line,flags
15 .section __bug_table,"aw"
165001: .4byte \addr - .
17 .4byte 5002f - .
18 .short \line, \flags
19 .org 5001b+BUG_ENTRY_SIZE
20 .previous
21 .section .rodata,"a"
225002: .asciz "\file"
23 .previous
24.endm
25#else
26.macro __EMIT_BUG_ENTRY addr,file,line,flags
27 .section __bug_table,"aw"
285001: .4byte \addr - .
29 .short \flags
30 .org 5001b+BUG_ENTRY_SIZE
31 .previous
32.endm
33#endif /* verbose */
34
35.macro EMIT_WARN_ENTRY addr,file,line,flags
36 EX_TABLE(\addr,\addr+4)
37 __EMIT_BUG_ENTRY \addr,\file,\line,\flags
38.endm
39
40.macro EMIT_BUG_ENTRY addr,file,line,flags
41 .if \flags & 1 /* BUGFLAG_WARNING */
42 .err /* Use EMIT_WARN_ENTRY for warnings */
43 .endif
44 __EMIT_BUG_ENTRY \addr,\file,\line,\flags
45.endm
46
47#else /* !__ASSEMBLY__ */
48/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
49 sizeof(struct bug_entry), respectively */
50#ifdef CONFIG_DEBUG_BUGVERBOSE
51#define _EMIT_BUG_ENTRY \
52 ".section __bug_table,\"aw\"\n" \
53 "2: .4byte 1b - .\n" \
54 " .4byte %0 - .\n" \
55 " .short %1, %2\n" \
56 ".org 2b+%3\n" \
57 ".previous\n"
58#else
59#define _EMIT_BUG_ENTRY \
60 ".section __bug_table,\"aw\"\n" \
61 "2: .4byte 1b - .\n" \
62 " .short %2\n" \
63 ".org 2b+%3\n" \
64 ".previous\n"
65#endif
66
67#define BUG_ENTRY(insn, flags, ...) \
68 __asm__ __volatile__( \
69 "1: " insn "\n" \
70 _EMIT_BUG_ENTRY \
71 : : "i" (__FILE__), "i" (__LINE__), \
72 "i" (flags), \
73 "i" (sizeof(struct bug_entry)), \
74 ##__VA_ARGS__)
75
76#define WARN_ENTRY(insn, flags, label, ...) \
77 asm_volatile_goto( \
78 "1: " insn "\n" \
79 EX_TABLE(1b, %l[label]) \
80 _EMIT_BUG_ENTRY \
81 : : "i" (__FILE__), "i" (__LINE__), \
82 "i" (flags), \
83 "i" (sizeof(struct bug_entry)), \
84 ##__VA_ARGS__ : : label)
85
86/*
87 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
88 * optimisations. However depending on the complexity of the condition
89 * some compiler versions may not produce optimal results.
90 */
91
92#define BUG() do { \
93 BUG_ENTRY("twi 31, 0, 0", 0); \
94 unreachable(); \
95} while (0)
96#define HAVE_ARCH_BUG
97
98#define __WARN_FLAGS(flags) do { \
99 __label__ __label_warn_on; \
100 \
101 WARN_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags), __label_warn_on); \
102 unreachable(); \
103 \
104__label_warn_on: \
105 break; \
106} while (0)
107
108#ifdef CONFIG_PPC64
109#define BUG_ON(x) do { \
110 if (__builtin_constant_p(x)) { \
111 if (x) \
112 BUG(); \
113 } else { \
114 BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x))); \
115 } \
116} while (0)
117
118#define WARN_ON(x) ({ \
119 bool __ret_warn_on = false; \
120 do { \
121 if (__builtin_constant_p((x))) { \
122 if (!(x)) \
123 break; \
124 __WARN(); \
125 __ret_warn_on = true; \
126 } else { \
127 __label__ __label_warn_on; \
128 \
129 WARN_ENTRY(PPC_TLNEI " %4, 0", \
130 BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \
131 __label_warn_on, \
132 "r" ((__force long)(x))); \
133 break; \
134__label_warn_on: \
135 __ret_warn_on = true; \
136 } \
137 } while (0); \
138 unlikely(__ret_warn_on); \
139})
140
141#define HAVE_ARCH_BUG_ON
142#define HAVE_ARCH_WARN_ON
143#endif
144
145#endif /* __ASSEMBLY __ */
146#else
147#ifdef __ASSEMBLY__
148.macro EMIT_BUG_ENTRY addr,file,line,flags
149.endm
150.macro EMIT_WARN_ENTRY addr,file,line,flags
151.endm
152#else /* !__ASSEMBLY__ */
153#define _EMIT_BUG_ENTRY
154#define _EMIT_WARN_ENTRY
155#endif
156#endif /* CONFIG_BUG */
157
158#include <asm-generic/bug.h>
159
160#ifndef __ASSEMBLY__
161
162struct pt_regs;
163void hash__do_page_fault(struct pt_regs *);
164void bad_page_fault(struct pt_regs *, int);
165extern void _exception(int, struct pt_regs *, int, unsigned long);
166extern void _exception_pkey(struct pt_regs *, unsigned long, int);
167extern void die(const char *, struct pt_regs *, long);
168void die_mce(const char *str, struct pt_regs *regs, long err);
169extern bool die_will_crash(void);
170extern void panic_flush_kmsg_start(void);
171extern void panic_flush_kmsg_end(void);
172#endif /* !__ASSEMBLY__ */
173
174#endif /* __KERNEL__ */
175#endif /* _ASM_POWERPC_BUG_H */